Search results for "behaviour"

Time–carbonyl groups equivalence in photo-oxidative aging of virgin/recycled polymer blends

2004

AbstractThe photo-oxidation behaviour of polymers is strongly dependent on the initial amount of carbonyl groups along the chains. The growing use of recycled post-consumer polymers coming from products used outdoors and then photo-oxidised, both pure and blended with the same virgin polymer, gives rise to an unpredictable behaviour of weathering resistance of products made with these materials. The present work shows that the carbonyl group–exposure time curves can be shifted along the time axis to give a single generalised master plot. It is then possible to predict the formation of the new carbonyl groups by knowing only the initial amount of the same carbonyl groups. The same shift fact…

Effect of a sensory education programme on children’s preferences and eating behavior

2016

The children of immigrants in France: The emergence of a second generaton with the collaboration of Esin Gezer Special Series on Children in Immigran…

2009

International audience; Since the mid - 1970s, immigration for family reunification has been more important than labour fo rce immigration. Most residence permits are granted because of family relationships. The immigrant population has been ageing. More than half the Italian immigrants are over 65. While second - generation Italians and Spaniards represent nearly half all immig rants 18 and over, they have been largely overtaken in the 0 – 17 age group by second - generation Algerians, Moroccans, Portuguese and sub - Saharan Africans. Of the last group, 21 per cent are under 25 years of age. Immigrants who arrived in France less than 1 0 years ago are more highly qualified than previous im…

The nail that sticks out : the practice of individuality in the East Asian classroom

2015

Itä-Aasian kulttuuri suosii käytöstä, jolla ei erotuta joukosta yksilönä, ja tämä näkyy Itä-Aasian luokkahuoneissa hiljaisuutena. Itä-Aasiasta kertovat luokkahuonetutkimukset ovat pitkälti keskittyneet siellä vallitsevaan kulttuurin suosimaan hiljaisuuteen ja yhteisöllisyyteen, eikä tutkimuksia ole juurikaan julkaistu itä-aasialaisten luokkahuonekäytöksestä muusta luokasta erottuvina yksilöinä. Tämä tutkimus pyrkii selvittämään milloin itä-aasialainen oppilas pystyy erottumaan vertaisistaan luokkahuoneessa ilman, että häneen kohdistuu paheksuntaa tai syrjintää. Aineisto kerättiin haastattelemalla kahta itä-aasialaista yliopisto-opiskelijaa heidän luokkahuonekokemuksistaan. Pääpaino oli koke…

Longitudinal associations of physical activity and pubertal development with academic achievement in adolescents.

2020

Highlights • Boys with higher levels of moderate-to-vigorous physical activity had better academic achievement than those with lower levels of physical activity at baseline. • Physical activity was not associated with academic achievement at follow-up in boys or girls. • Continuously inactive adolescents had poorer academic achievement over the follow-up period than their more active peers. • Girls with more advanced pubertal status had better academic achievement than other girls.

The joint evolution of learning and dispersal maintains intraspecific diversity in metapopulations

2021

The evolution of dispersal tendencies and of cognitive abilities have both been intensely studied. Yet little attention has been given to the question of how these two aspects may relate to each other, as a result of their joint evolution. On the one hand, learning abilities may help dispersers to cope with their new habitat. On the other hand, dispersal may sometimes reduce the need for learning, because local environments may differ in how much there is to learn. To get a better understanding of this relationship, we built an individual‐based simulation in which both learning speed and dispersal tendency were free to evolve. We found that both positive and negative correlations could evol…

Modelling the evolution of cognitive styles.

2019

Abstract Individuals consistently differ in behaviour, exhibiting so-called personalities. In many species, individuals differ also in their cognitive abilities. When personalities and cognitive abilities occur in distinct combinations, they can be described as ‘cognitive styles’. Both empirical and theoretical investigations produced contradicting or mixed results regarding the complex interplay between cognitive styles and environmental conditions. Here we use individual-based simulations to show that, under just slightly different environmental conditions, different cognitive styles exist and under a variety of conditions, can also co-exist. Co-existences are based on individual speciali…

Determinants of Cognitive Performance in Children and Adolescents : A Populational Longitudinal Study

2022

We evaluated the determinants of cognitive performance in children and adolescents. This is a longitudinal study, secondary analysis of the Physical Activity and Nutrition in Children (PANIC) study. We assessed 502 children (51.6% girls) at middle childhood (range: 6.6 to 9.0 years), at late childhood, 437 children (51.0% girls, range: 8.8 to 11.2 years), and in 277 adolescents (54.5% girls, range: 15.0 to 17.4 years). Raven’s progressive matrices tests estimated the participants’ cognitive performance (outcome variable) at all time points. In total, we evaluated 29 factors from various dimensions (prenatal, neonatal, child fitness, lifestyle and anthropometrics). None of the neonatal and a…

Northward range expansion requires synchronization of both overwintering behaviour and physiology with photoperiod in the invasive Colorado potato be…

2014

Abstract. Photoperiodic phenological adaptations are prevalent in many organisms living in seasonal environments. As both photoperiod and growth season length change with latitude, species undergoing latitudinal range expansion often need to synchronize their life cycle with a changing photoperiod and growth season length. Since adaptive synchronization often involves a large number of time-consuming genetic changes, behavioural plasticity might be a faster way to adjust to novel conditions. We compared behavioural and physiological traits in overwintering (diapause) preparation in three latitudinally different European Colorado potato beetle (Leptinotarsa decemlineata) populations reared u…

Effect of inter-individual variability and intraguild interferences on the foraging strategies of seed-eating carabid species

2017

Making a choice requires, implicitly, an investment of time in one behaviour at the expense of an investment in another. Being choosy would increase the risk of losing many food item opportunities to competitors, and is directly in conflict with other essential tasks such as predator avoidance. Individuals are thus expected to adjust their level of choosiness in response to the competition and predation context. The available behavioural ecological theory and the empirical ecology of carabids would suggest that competition and predation interference induces changes in the foraging behaviour of carabid individuals. Carabids typically operate within communities in which competition and predat…